4 files changed, 6 insertions, 3 deletions
diff --git a/src/Text/Pandoc/Shared.hs b/src/Text/Pandoc/Shared.hs
index 93a575809..51da34e79 100644
--- a/src/Text/Pandoc/Shared.hs
+++ b/src/Text/Pandoc/Shared.hs
@@ -1,5 +1,5 @@
 {-# LANGUAGE DeriveDataTypeable, CPP, MultiParamTypeClasses,
-    FlexibleContexts, ScopedTypeVariables #-}
+    FlexibleContexts, ScopedTypeVariables, PatternGuards #-}
 {-
 Copyright (C) 2006-2014 John MacFarlane <jgm@berkeley.edu>
 
diff --git a/src/Text/Pandoc/Writers/Docbook.hs b/src/Text/Pandoc/Writers/Docbook.hs
index bc4732d7f..367193116 100644
--- a/src/Text/Pandoc/Writers/Docbook.hs
+++ b/src/Text/Pandoc/Writers/Docbook.hs
@@ -1,4 +1,4 @@
-{-# LANGUAGE OverloadedStrings #-}
+{-# LANGUAGE OverloadedStrings, PatternGuards #-}
 {-
 Copyright (C) 2006-2014 John MacFarlane <jgm@berkeley.edu>
 
diff --git a/src/Text/Pandoc/Writers/FB2.hs b/src/Text/Pandoc/Writers/FB2.hs
index ddbb976ef..233b8b32b 100644
--- a/src/Text/Pandoc/Writers/FB2.hs
+++ b/src/Text/Pandoc/Writers/FB2.hs
@@ -1,3 +1,5 @@
+{-# LANGUAGE PatternGuards #-}
+
 {-
 Copyright (c) 2011-2012, Sergey Astanin
 All rights reserved.
diff --git a/src/Text/Pandoc/Writers/LaTeX.hs b/src/Text/Pandoc/Writers/LaTeX.hs
index 3ea070ee7..d140932a7 100644
--- a/src/Text/Pandoc/Writers/LaTeX.hs
+++ b/src/Text/Pandoc/Writers/LaTeX.hs
@@ -1,4 +1,5 @@
-{-# LANGUAGE OverloadedStrings, ScopedTypeVariables #-}
+{-# LANGUAGE OverloadedStrings, ScopedTypeVariables,
+             PatternGuards #-}
 {-
 Copyright (C) 2006-2014 John MacFarlane <jgm@berkeley.edu>